122 lines
2 KiB
Go
122 lines
2 KiB
Go
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package influxdb
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strconv"
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)
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const (
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nodeFile = "node.json"
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oldNodeFile = "id"
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peersFilename = "peers.json"
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)
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type Node struct {
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path string
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ID uint64
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}
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// LoadNode will load the node information from disk if present
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func LoadNode(path string) (*Node, error) {
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// Always check to see if we are upgrading first
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if err := upgradeNodeFile(path); err != nil {
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return nil, err
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}
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n := &Node{
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path: path,
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}
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f, err := os.Open(filepath.Join(path, nodeFile))
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if err != nil {
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return nil, err
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}
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defer f.Close()
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if err := json.NewDecoder(f).Decode(n); err != nil {
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return nil, err
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}
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return n, nil
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}
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// NewNode will return a new node
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func NewNode(path string) *Node {
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return &Node{
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path: path,
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}
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}
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// Save will save the node file to disk and replace the existing one if present
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func (n *Node) Save() error {
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file := filepath.Join(n.path, nodeFile)
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tmpFile := file + "tmp"
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f, err := os.Create(tmpFile)
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if err != nil {
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return err
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}
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if err = json.NewEncoder(f).Encode(n); err != nil {
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f.Close()
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return err
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}
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if err = f.Close(); nil != err {
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return err
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}
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return os.Rename(tmpFile, file)
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}
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func upgradeNodeFile(path string) error {
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oldFile := filepath.Join(path, oldNodeFile)
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b, err := ioutil.ReadFile(oldFile)
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if err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return err
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}
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// We shouldn't have an empty ID file, but if we do, ignore it
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if len(b) == 0 {
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return nil
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}
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peers := []string{}
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pb, err := ioutil.ReadFile(filepath.Join(path, peersFilename))
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if err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return err
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}
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err = json.Unmarshal(pb, &peers)
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if err != nil {
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return err
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}
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if len(peers) > 1 {
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return fmt.Errorf("to upgrade a cluster, please contact support at influxdata")
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}
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n := &Node{
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path: path,
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}
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if n.ID, err = strconv.ParseUint(string(b), 10, 64); err != nil {
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return err
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}
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if err := n.Save(); err != nil {
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return err
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}
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if err := os.Remove(oldFile); err != nil {
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return err
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}
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return nil
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}
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